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GrainGenes Reference Report: PHY-93-860

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Reference	PHY-93-860
Title	Quantitative trait loci associated with seedling resistance to isolates of Puccinia coronata in oat
Journal	Phytopathology
Year	2003
Volume	93
Pages	860-866
Author	Zhu SQ Leonard KJ Kaeppler HF
Abstract	In our previous report, quantitative trait loci (QTL) for field adult plant resistance to crown rust were identified in an oat population of 152 F5:6 recombinant inbred lines from the cross of 'Ogle' (susceptible)/MAM17-5 (resistant). The objectives of the present study were to identify in the same population, the number, genomic location, and effect of QTL and digenic QTL epistasis associated with greenhouse seedling resistance to isolates of Puccinia coronata to determine if the QTL detected are isolate-specific and to compare them with previously detected QTL for field resistance. Reaction type was scored on greenhouse seedlings inoculated with three isolates. Composite interval mapping was conducted to identify genomic regions associated with resistance using a framework map of 272 molecular markers. Two QTL, Pcq1 and Pcq2, were identified for resistance to each of the three isolates. Pcq1, the major QTL controlling field resistance, did not confer detectable greenhouse seedling resistance when present singly; however, Pcq1 did serve as an enhancer of seedling resistance when it was combined with Pcq2. The final model explained 76.5, 77.9, and 79.3% of total phenotypic variation for resistance to isolates MNB248, MNB249, and MNB251, respectively. Race-specificity of quantitative resistance remains to be further examined.
External Databases	https://doi.org/10.1094/PHYTO.2003.93.7.860
Map Data	Oat-2003-OxM-QTL2
QTL	QPc.OxM-QTL2_28.1 [ Show all 6 ]
Keyword	[ Hide all but 1 of 41 ] adult plant resistance barley composite interval mapping conferring resistance crown-rust resistance diploid avena enhancer epistasis f-sp avenae field field-resistance framework genomic genomic regions interval interval mapping isolate leaf rust locus map mapping model oat objectives phenotypic variation plant resistance population qtl quantitative quantitative resistance quantitative trait loci recombinant inbred recombinant inbred line remains resistance resistant rust seedling seedling resistance trait trait loci

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